Put down another one for the FATTY, I seen alot more of this pipe on YZ 125's than any other. I'd only get the pipe don't waste the money on a silencer, take that money and get the delta reedblock. You might want to also check the float hieght cause they was off on some bikes stock as much as 2mm. I know the float hieght is off on my '02 cause it bog/burbles ever so slightly once in awhile from hard landings. Personally I don't see why you want to change the pipe all ready. I feel the bike is fast enough all ready, IMO I think you'd be better off with changing the reed block. I don't think the gain will be as noticable with changing the pipe. just my .02 :p
Joe
'02 YZ125